题解 | #2021年11月每天的人均浏览文章时长#
2021年11月每天的人均浏览文章时长
http://www.nowcoder.com/practice/8e33da493a704d3da15432e4a0b61bb3
select
date(in_time) dt,
round(sum(timestampdiff(second,in_time,out_time)) / count(distinct uid),1) avg_lensec
from tb_user_log
where date_format(in_time,"%Y-%m") = "2021-11" and artical_id != 0
group by dt
order by avg_lensec
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